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172 lines
3.7 KiB
172 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2000-2001 Vojtech Pavlik |
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*/ |
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/* |
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* Gunze AHL-51S touchscreen driver for Linux |
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*/ |
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/* |
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*/ |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/input.h> |
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#include <linux/serio.h> |
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#define DRIVER_DESC "Gunze AHL-51S touchscreen driver" |
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MODULE_AUTHOR("Vojtech Pavlik <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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/* |
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* Definitions & global arrays. |
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*/ |
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#define GUNZE_MAX_LENGTH 10 |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct gunze { |
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struct input_dev *dev; |
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struct serio *serio; |
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int idx; |
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unsigned char data[GUNZE_MAX_LENGTH]; |
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char phys[32]; |
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}; |
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static void gunze_process_packet(struct gunze *gunze) |
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{ |
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struct input_dev *dev = gunze->dev; |
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if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || |
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(gunze->data[0] != 'T' && gunze->data[0] != 'R')) { |
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printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); |
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return; |
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} |
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input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); |
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input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); |
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input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); |
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input_sync(dev); |
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} |
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static irqreturn_t gunze_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct gunze *gunze = serio_get_drvdata(serio); |
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if (data == '\r') { |
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gunze_process_packet(gunze); |
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gunze->idx = 0; |
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} else { |
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if (gunze->idx < GUNZE_MAX_LENGTH) |
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gunze->data[gunze->idx++] = data; |
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} |
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return IRQ_HANDLED; |
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} |
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/* |
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* gunze_disconnect() is the opposite of gunze_connect() |
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*/ |
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static void gunze_disconnect(struct serio *serio) |
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{ |
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struct gunze *gunze = serio_get_drvdata(serio); |
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input_get_device(gunze->dev); |
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input_unregister_device(gunze->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(gunze->dev); |
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kfree(gunze); |
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} |
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/* |
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* gunze_connect() is the routine that is called when someone adds a |
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* new serio device that supports Gunze protocol and registers it as |
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* an input device. |
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*/ |
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static int gunze_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct gunze *gunze; |
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struct input_dev *input_dev; |
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int err; |
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gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!gunze || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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gunze->serio = serio; |
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gunze->dev = input_dev; |
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snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys); |
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input_dev->name = "Gunze AHL-51S TouchScreen"; |
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input_dev->phys = gunze->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_GUNZE; |
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input_dev->id.product = 0x0051; |
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input_dev->id.version = 0x0100; |
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input_dev->dev.parent = &serio->dev; |
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
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input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); |
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serio_set_drvdata(serio, gunze); |
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err = serio_open(serio, drv); |
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if (err) |
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goto fail2; |
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err = input_register_device(gunze->dev); |
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if (err) |
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goto fail3; |
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return 0; |
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fail3: serio_close(serio); |
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fail2: serio_set_drvdata(serio, NULL); |
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fail1: input_free_device(input_dev); |
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kfree(gunze); |
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return err; |
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} |
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/* |
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* The serio driver structure. |
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*/ |
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static const struct serio_device_id gunze_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_GUNZE, |
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.id = SERIO_ANY, |
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.extra = SERIO_ANY, |
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}, |
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{ 0 } |
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}; |
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MODULE_DEVICE_TABLE(serio, gunze_serio_ids); |
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static struct serio_driver gunze_drv = { |
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.driver = { |
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.name = "gunze", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = gunze_serio_ids, |
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.interrupt = gunze_interrupt, |
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.connect = gunze_connect, |
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.disconnect = gunze_disconnect, |
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}; |
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module_serio_driver(gunze_drv);
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